A course designed to be rapidly taken (9)

I believe the answer is:

racetrack

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'a course' is the definition.
(I know that racecourse is a type of course)

I can't explain the remainder of the clue.

(Other definitions for racetrack that I've seen before include "Competitive course" , "Newmarket, say" , "Circuit" , "Spa, say" , "Course for dogs or cycling?" .)

I've seen this clue in The Globe and Mail.

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